International Journal of Mechanical Sciences最新文献_第10页

Rotary vibration texturing of orientation-controllable microstructures via tool inclination 刀具倾角作用下取向可控微结构的旋转振动变形

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-01-30 DOI: 10.1016/j.ijmecsci.2026.111327

Kaiyue Wu , Jianfu Zhang , Peiyuan Ding , Jiahui Liu , Xiangyu Zhang , Pingfa Feng , Jianjian Wang

Vibration texturing has emerged as a promising method for fabricating functional surface microstructures owing to its high efficiency, precision, and ability to preserve material chemical properties. However, current vibration texturing methods exhibit limitations in controlling microstructure orientation, which restricts the range of achievable structures and their application potential. This study proposes a rotary vibration texturing method that overcomes these limitations by actively controlling microstructure orientation through adjustment of the tool-edge inclination. A key theoretical discovery is the existence of a critical inclination angle that distinguishes between cutting-type and chiseling-type vibration texturing. Based on the discovery, a model of the critical angle as a function of processing parameters and tool shapes was established. A rotary vibration device for precise control of the tool-edge inclination angle was developed, and a post-calibration compensation method was adopted to eliminate the tool centering error after rotation. Finally, surface texturing experiments were conducted to validate the efficacy of the proposed method for controlling the orientation of microstructures and the accuracy of the critical angle calculation. Consequently, a three-layer optical variable device and microstructure arrays with tailored anisotropic wettability were fabricated using the two distinct modes. These results demonstrate the potential of the rotary vibration texturing method for expanding the processing and application scope of functional microstructured surfaces.

振动织构因其高效率、高精度和保持材料化学性质的能力而成为制造功能性表面微结构的一种很有前途的方法。然而，现有的振动织构方法在控制微观结构取向方面存在局限性，这限制了可实现结构的范围和应用潜力。本研究提出了一种旋转振动织构方法，通过调整刃口倾角来主动控制微结构取向，从而克服了这些局限性。一个关键的理论发现是存在一个区分切削型和凿凿型振动变形的临界倾角。在此基础上，建立了临界角随加工参数和刀具形状的函数模型。研制了一种精确控制刀刃倾角的旋转振动装置，并采用后校正补偿方法消除了刀具旋转后对中误差。最后，通过表面织构实验验证了该方法对微结构取向控制的有效性和临界角计算的准确性。因此，采用两种不同的模式制备了具有定制各向异性润湿性的三层光学可变器件和微观结构阵列。这些结果证明了旋转振动织构法在扩大功能微结构表面加工和应用范围方面的潜力。

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引用次数: 0

Hysteretic friction in elastomer-rough surface contacts: A continuum mechanics approach without empirical parameters 弹性体-粗糙表面接触中的滞回摩擦：无经验参数的连续介质力学方法

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-01-30 DOI: 10.1016/j.ijmecsci.2026.111305

Iván E. Rango , Fernando S. Buezas , Germán Prieto , Marcelo Failla

Friction in viscoelastic contacts with rough rigid surfaces is commonly described using phenomenological laws or semi-empirical models, which limit predictive capability outside calibrated conditions. In this article, we present a continuum mechanics framework capable of predicting viscoelastic friction coefficients without prescribing empirical friction laws or adjustable parameters. The friction coefficient emerges naturally from the contact interaction between a deformable elastomer and a rigid rough surface, driven by the interplay between surface geometry, material rheology, and the geometric nonlinearity inherent to finite deformations. A two-dimensional model was implemented in COMSOL Multiphysics® using the finite element method. The viscoelastic constitutive response was described by a finite-strain formulation combining Neo-Hookean hyperelasticity with viscous dissipation, expressed in terms of the second Piola–Kirchhoff stress tensor. This nonlinear framework captures the large local deformations that occur at asperity contacts, which play a critical role in the energy dissipation mechanism underlying hysteretic friction. The experimentally measured surface topography, obtained via confocal microscopy, and the frequency-dependent rheological parameters of nitrile butadiene rubber (NBR), determined through dynamic mechanical analysis, were directly incorporated into the formulation. Friction coefficients were evaluated from both simulations and tribometric tests under controlled sliding velocities (0.25–5 mm/s) and normal pressures (5–50 kPa). The results show quantitative agreement between predicted and measured values, capturing the velocity-dependent hysteresis mechanism, the characteristic Grosch-like bell-shaped friction curve, and the saturation of contact area with increasing normal pressure. This approach establishes a robust connection between continuum-mechanics-based modeling and tribological experiments, paving the way toward a numerical tribometer capable of predicting frictional responses of elastomers against real rough surfaces across a wide variety of contact conditions.

与粗糙刚性表面的粘弹性接触中的摩擦通常使用现象学定律或半经验模型来描述，这限制了校准条件之外的预测能力。在本文中，我们提出了一个连续介质力学框架，能够预测粘弹性摩擦系数，而无需规定经验摩擦定律或可调参数。摩擦系数是由可变形弹性体与刚性粗糙表面之间的接触相互作用自然产生的，由表面几何形状、材料流变学和有限变形固有的几何非线性之间的相互作用驱动。在COMSOL Multiphysics®中使用有限元方法实现了二维模型。粘弹性本构响应由Neo-Hookean超弹性与粘性耗散相结合的有限应变公式描述，以第二Piola-Kirchhoff应力张量表示。这种非线性框架捕获了发生在粗糙接触处的大局部变形，这在迟滞摩擦的能量耗散机制中起着关键作用。通过共聚焦显微镜获得的实验测量的表面形貌，以及通过动态力学分析确定的丁腈橡胶（NBR）的频率相关流变参数，直接纳入配方中。在控制滑动速度（0.25-5 mm/s）和常压（5-50 kPa）下，通过模拟和摩擦试验评估摩擦系数。结果表明，预测值与实测值在定量上一致，捕获了速度相关的滞后机制，特征的类格罗施钟形摩擦曲线，以及接触面积随法向压力的增加而饱和。这种方法在基于连续力学的建模和摩擦学实验之间建立了牢固的联系，为能够预测弹性体在各种接触条件下对真实粗糙表面的摩擦响应的数值摩擦计铺平了道路。

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引用次数: 0

Progressive failure and size effect in fiber-reinforced cementitious composites: A coupled elastoplastic-gradient damage approach 纤维增强胶凝复合材料的渐进破坏和尺寸效应：一种耦合弹塑性梯度损伤方法

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-01-30 DOI: 10.1016/j.ijmecsci.2026.111313

Shifan Liu , Yajun Cao , Wei Wang , Jianfu Shao

This work is devoted to numerical analysis of progressive failure process and structural size effect of fiber-reinforced cementitious composites. A new approach is proposed in the framework of coupled elastoplastic-gradient damage method. The composite is modeled within a phenomenological framework that integrates an ordinary concrete matrix with an equivalent fiber phase. Their coupling through elastic-brittle damage and plastic hardening captures progressive failure, while structural size effects emerge from the macroscopic competition between hardening and damage evolution. The proposed model is verified against uniaxial tension data, where the ductility and strain-hardening regime with peak strength of 4.88 MPa are reproduced. It accurately captures the experimentally observed deformation, damage evolution, and failure load in beams of varying sizes under both mode I and mixed-mode I/II cracking. With increasing beam depth, the computed nominal strength decreases from 4.17 to 2.27 MPa for mode I and from 5.73 to 3.48 MPa for mixed-mode failure. In particular, the structural size effect in fiber-reinforced cementitious composites is well described by the proposed model, without introducing any additional size-dependent parameters.

本文对纤维增强胶凝复合材料的渐进破坏过程和结构尺寸效应进行了数值分析。提出了一种新的弹塑性-梯度耦合损伤方法。该复合材料在一个现象学框架内建模，该框架将普通混凝土基体与等效纤维相集成。它们通过弹脆损伤和塑性硬化的耦合捕获了渐进破坏，而结构尺寸效应则来自于硬化和损伤演化之间的宏观竞争。利用单轴拉伸数据对模型进行了验证，重现了峰值强度为4.88 MPa时的塑性和应变硬化状态。它准确地捕捉了实验观察到的变形、损伤演变和破坏载荷在不同尺寸的梁在模式I和混合模式I/II开裂。随着梁深的增加，计算出的名义强度在ⅰ模态下从4.17 MPa降至2.27 MPa，在混合模态下从5.73 MPa降至3.48 MPa。特别是，在不引入任何额外的尺寸相关参数的情况下，所提出的模型很好地描述了纤维增强胶凝复合材料的结构尺寸效应。

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引用次数: 0

Adaptive nonlinear-error control method for five-axis machining of complex structures 复杂结构五轴加工的自适应非线性误差控制方法

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-01-29 DOI: 10.1016/j.ijmecsci.2026.111322

Yong Zhang , Tao Wu , Yongfei Wang , Bin Hu , Chen Li

Five-axis computerized numerical control (CNC) machine tools exhibit significant advantages in complex structure machining and high-precision manufacturing owing to their multi-degree-of-freedom coordinated motion capability and high dynamic performance. However, the coupling effects between rotary and linear axes generate nonlinear errors during motion, thereby reducing machining accuracy. In this study, a novel adaptive toolpath densification algorithm based on nonlinear error thresholds of estimated interpolation points was developed to compensate for nonlinear errors in real-time interpolation offline. First, the necessary conditions for zero nonlinear error of densified toolpath points were analyzed and initial densified toolpath points were obtained based on transition angle tolerance. Second, the speed constraints of densified toolpath points were evaluated by considering toolpath transition angles and a speed-fitting model integrated with a local look-ahead strategy. Finally, rapid adaptive iterative compensation of initial densified toolpath points was achieved by evaluating the nonlinear errors of estimated interpolation points in the current toolpath segment. To further increase toolpath smoothness, a toolpath-plane-rotation vector coordinate optimization algorithm was designed. Five-axis machining experiments of a complex structural model were carried out to verify the effectiveness of optimization algorithms. The results demonstrate that the optimization strategies achieved a marked enhancement in surface form accuracy and machining process stability, with the improvement margin exceeding 10%. This study provides new insights for controlling nonlinear errors in five-axis CNC machining of complex structural models.

五轴数控机床以其多自由度的协调运动能力和高动态性能在复杂结构加工和高精度制造中具有显著的优势。然而，旋转轴和直线轴之间的耦合效应在运动过程中产生非线性误差，从而降低了加工精度。针对实时插补中的非线性误差，提出了一种基于估计插补点非线性误差阈值的自适应刀路密度化算法。首先，分析了致密化刀路点非线性误差为零的必要条件，并基于过渡角公差得到初始致密化刀路点；其次，通过考虑刀路过渡角和结合局部前瞻策略的速度拟合模型，评估了密集刀路点的速度约束；最后，通过评估当前刀路段内估计插值点的非线性误差，实现了初始密集刀路点的快速自适应迭代补偿。为了进一步提高刀路平滑度，设计了一种刀路-平面-旋转矢量坐标优化算法。为验证优化算法的有效性，对一个复杂结构模型进行了五轴加工实验。结果表明，优化策略在表面形状精度和加工过程稳定性方面均有显著提高，改进幅度超过10%。该研究为复杂结构模型五轴数控加工中的非线性误差控制提供了新的思路。

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引用次数: 0

Dual-stage energy-absorbing corrugated-reinforced re-entrant honeycomb with enhanced stiffness 具有增强刚度的双级吸能波纹增强再入蜂窝

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-01-29 DOI: 10.1016/j.ijmecsci.2026.111319

Wang Jian , Zhong Yifeng , Tang Yuxin , Poh Leong Hien

This study presents a novel bio-inspired corrugated-reinforced re-entrant honeycomb (CRH) with a unique externally attached reinforcement topology, designed to overcome the stiffness and energy absorption limitations of conventional auxetic honeycombs. Unlike previous internally reinforced or nested designs, the CRH incorporates independent wavy reinforcements along its outer boundary, leading to a previously unreported dual-stage plateau behavior under compression. Quasi-static compression tests and finite element simulations reveal that this behavior is initiated by contact between the corrugated reinforcements and inner inclined struts, followed by interaction with the horizontal ligaments. Compared to traditional re-entrant honeycombs, the CRH demonstrates approximately 10-fold higher initial stiffness, 3-fold greater plateau stress, and 2.375-fold improvement in specific energy absorption. To enable efficient large-scale analysis, a novel 3D equivalent Cauchy model (3D-ECM) is developed and validated for rapid prediction of effective elastic properties. Theoretical models based on unit cell collapse mechanisms accurately predict the dual-plateau stresses. Parametric studies identify an optimal design with a re-entrant angle of 65°, strut spacing ratio of 1.5, and strut thickness ratio of 1.0, offering superior stiffness, energy absorption, and preserved auxeticity. The CRH represents a significant advance in auxetic metamaterial design, providing a lightweight and highly efficient energy-absorbing structure for impact-resistant applications.

本研究提出了一种新颖的仿生波纹增强再入式蜂窝（CRH），具有独特的外部附加增强拓扑结构，旨在克服传统增减蜂窝的刚度和能量吸收限制。与之前的内部加固或嵌套设计不同，CRH在其外边界处采用了独立的波状加固，导致了以前未报道的压缩下的双阶段平台行为。准静态压缩试验和有限元模拟结果表明，波纹增强筋首先与内部倾斜支撑接触，然后与水平韧带相互作用。与传统的重入式蜂窝相比，CRH的初始刚度提高了约10倍，平台应力提高了3倍，比能吸收提高了2.375倍。为了实现高效的大规模分析，开发并验证了一种新的三维等效柯西模型（3D- ecm），用于快速预测有效弹性特性。基于单元胞崩溃机制的理论模型可以准确预测双平台应力。参数化研究确定了最优设计方案：可重入角为65°，支撑间距比为1.5，支撑厚度比为1.0，具有优越的刚度、能量吸收和保留的刚度。CRH代表了消声超材料设计的重大进步，为抗冲击应用提供了轻质、高效的吸能结构。

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引用次数: 0

High-speed and super-resolution ultrasonic imaging method for multilayer structures 多层结构的高速超分辨率超声成像方法

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-01-29 DOI: 10.1016/j.ijmecsci.2026.111324

Binwen Li , Xinqi Tian , Weijia Shi , Bo Zhao , Jiubin Tan

Multilayer structures are necessary in aerospace and transportation. The ultrasonic imaging technique is widely used to detect these parts, ensuring their reliability in manufacturing and service. However, the most common imaging method, TFM (Total Focusing Method), fails to characterize defects when the defect spacing is less than the Rayleigh limit. Although the MTR-MUSIC (Modified Time-Reversal Multiple-Signal Classification) method can realize super-resolution imaging for closely spaced defects, its computational complexity increases exponentially with the number of layers, which is impossible for real-time scenarios. To overcome this problem, the F (fast)-MTR-MUSIC is proposed to realize high-speed and super-resolution defect imaging in multilayer structures. Firstly, the nonstationary wavefield extrapolation is used to migrate array data to the upper surface of the defect layer. Then, the wavenumber imaging index and the TR-MUSIC imaging index are calculated using migrated array data, and are multiplied together to form the F-MTR-MUSIC imaging index. Through this method, the computational complexity is proportional to the number of layers rather than an exponential relationship. Results demonstrate that the proposed F-MTR-MUSIC, which is the state-of-the-art imaging method in the super-resolution imaging of multilayer structures, exhibits a higher resolution than TFM, and faster speed than MTR-MUSIC in multilayer structures. For the defects spaced at 0.78 times of the Rayleigh limit in triple-layer structures, the PCID of the F-MTR-MUSIC is larger than 10.67 dB, and the computation time is <4.33 s, whereas the PCID of the TFM is smaller than 2.06 dB, and the imaging time of the MTR-MUSIC is longer than 172.40 s. Additional imaging results revealing inclined distributed holes and cracks further validate the practicality of F-MTR-MUSIC. This method shows promise for online monitoring of material manufacturing processes, including injection molding and additive manufacturing.

多层结构在航空航天和交通运输中是必不可少的。超声成像技术被广泛应用于这些部件的检测，保证了它们在制造和使用中的可靠性。然而，当缺陷间距小于瑞利极限时，最常用的成像方法TFM（全聚焦法）无法表征缺陷。MTR-MUSIC （Modified Time-Reversal Multiple-Signal Classification）方法虽然可以实现近间隔缺陷的超分辨率成像，但其计算复杂度随着层数呈指数增长，在实时场景下是不可能实现的。为了克服这一问题，提出了F (fast)-MTR-MUSIC实现多层结构的高速超分辨缺陷成像。首先，采用非平稳波场外推法将阵列数据迁移到缺陷层的上表面；然后，利用迁移阵列数据计算波数成像指数和TR-MUSIC成像指数，并将其相乘形成F-MTR-MUSIC成像指数。通过这种方法，计算复杂度与层数成正比，而不是呈指数关系。结果表明，所提出的多层结构超分辨率成像方法F-MTR-MUSIC具有比TFM更高的分辨率和比MTR-MUSIC更快的成像速度，是目前最先进的多层结构超分辨率成像方法。对于三层结构中间隔为瑞利极限0.78倍的缺陷，F-MTR-MUSIC的PCID大于10.67 dB，计算时间为4.33 s，而TFM的PCID小于2.06 dB， MTR-MUSIC的成像时间大于172.40 s。额外的成像结果显示倾斜分布的孔洞和裂缝进一步验证了F-MTR-MUSIC的实用性。该方法有望用于在线监测材料制造过程，包括注射成型和增材制造。

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引用次数: 0

Mechanical and thermal performance of functionally graded TPMS porous structures 功能梯度TPMS多孔结构的力学和热性能

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-01-28 DOI: 10.1016/j.ijmecsci.2026.111323

Shuai Chen , Shouning Deng , Jie Xu , Yanan Liu , Yunlong Chen , Xue Wan , Bing Wang , Linzhi Wu

Triply periodic minimal surface (TPMS) porous structures exhibit superior specific surface area, smooth geometry, and interconnected pore networks, which make them promising candidates for multifunctional applications such as lightweight energy absorption, thermal protection, and biomedical implants. However, systematic understanding of their coupled mechanical–thermal behavior and gradient design strategies remains limited. In this work, a comprehensive study on the mechanical and thermal performance of TPMS porous structures was conducted through parametric modeling, additive manufacturing (AM), finite element simulations, and experimental validation. Three representative TPMS configurations (Schwarz, Gyroid, and Diamond) were first constructed based on implicit equations, and Ti-6Al-4 V samples were fabricated using selective laser melting (SLM). Quasi-static compression tests and heat conduction experiments were performed to evaluate structural behavior, and the results were validated by finite element analysis. The effects of cell size, volume fraction, and structural type on compressive modulus, yield strength, and equivalent thermal conductivity were systematically revealed. Furthermore, functionally graded TPMS structures were proposed using one-dimensional gradients and fusion-transition strategies based on linear, sinusoidal, and power functions. Simulation results demonstrated that gradient configurations enable smooth variation in stiffness, strength, and thermal conductivity, providing superior tunability compared to uniform structures. The comparative analysis highlighted the potential of fusion-transition designs to overcome strength–thermal trade-offs and achieve customized multifunctional performance. This study establishes a theoretical and experimental foundation for the design of TPMS gradient porous structures, offering valuable guidance for the development of next-generation lightweight, load-bearing, and thermally efficient composite systems.

三周期最小表面（TPMS）多孔结构具有优越的比表面积，光滑的几何形状和相互连接的孔隙网络，使其成为多功能应用的有希望的候选者，如轻质能量吸收，热防护和生物医学植入物。然而，对其耦合力学-热行为和梯度设计策略的系统理解仍然有限。本文通过参数化建模、增材制造（AM）、有限元模拟和实验验证等方法，对TPMS多孔结构的力学和热性能进行了全面研究。首先基于隐式方程构建了三种具有代表性的TPMS构型（Schwarz、Gyroid和Diamond），并采用选择性激光熔化（SLM）法制备了ti - 6al - 4v样品。通过准静态压缩试验和热传导试验对结构性能进行了评价，并通过有限元分析对结果进行了验证。系统地揭示了胞体尺寸、体积分数和结构类型对压缩模量、屈服强度和等效导热系数的影响。此外，利用一维梯度和基于线性、正弦和幂函数的融合跃迁策略，提出了功能梯度TPMS结构。仿真结果表明，梯度结构能够在刚度、强度和导热系数方面实现平滑变化，与均匀结构相比，具有优越的可调性。对比分析强调了融合转换设计在克服强度-热权衡和实现定制多功能性能方面的潜力。本研究为TPMS梯度多孔结构的设计奠定了理论和实验基础，为开发下一代轻质、承载、热效率高的复合材料体系提供了有价值的指导。

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引用次数: 0

Analytical model for the mechanics underlying flatness defects 板形缺陷的力学分析模型

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-01-28 DOI: 10.1016/j.ijmecsci.2026.111321

Hao Wu, Jie Sun, Wen Peng, Dianhua Zhang

This study systematically investigates the intrinsic mechanical mechanism of flatness defects in rolled strips. It addresses key limitations in prior work, which have relied excessively on geometric shape analysis while neglecting fundamental mechanical principles. To overcome these limitations, a comprehensive analytical model for residual stress in rolled strips that incorporates crown evolution, transverse metal flow, and high-temperature stress relaxation is established. Subsequently, an exact analytical solution for the critical buckling stress of the strip is derived within the symplectic space Hamiltonian system without any assumptions. Based on this foundation, a novel analytical mechanical criterion for flatness defects is derived, marking a significant advancement over previous studies. The effectiveness of the analytical model is verified by comparing it with experimental results, thereby addressing the lack of explanation in prior theories for the internal mechanism of flatness defects. For instance, it reveals the inherent principle that rolling narrow strips is prone to center wave defects, while rolling wide strips exhibits the opposite tendency. Meanwhile, it is proved that complex flatness defects are caused by changes in residual compressive stress distribution induced by local stress relaxation due to severe non-uniform plastic deformation. Additionally, residual stress and flatness defects are controlled via derived critical crown ratios using the flatness criterion; consequently, an engineering criterion for tandem rolling is established across various strength grades and strip dimensions. Overall, this work shifts the paradigm in flatness analysis from a phenomenological description to a mechanics-based analytical framework.

本研究系统地探讨了轧制带材板形缺陷的内在力学机理。它解决了先前工作中的关键限制，这些工作过度依赖几何形状分析而忽略了基本的力学原理。为了克服这些限制，建立了一个综合的轧制带钢残余应力分析模型，该模型考虑了凸度演化、金属横向流动和高温应力松弛。随后，在没有任何假设的情况下，在辛空间哈密顿系统中导出了带材临界屈曲应力的精确解析解。在此基础上，导出了一种新的板形缺陷解析力学判据，这是前人研究的一个重大进展。通过与实验结果的对比，验证了分析模型的有效性，从而解决了以往理论对板形缺陷内部机理解释不足的问题。例如，揭示了轧制窄带材容易产生中心波缺陷，而轧制宽带材则相反的内在规律。同时，证明了复杂平面缺陷是由于严重的非均匀塑性变形引起的局部应力松弛引起残余压应力分布的变化引起的。此外，残余应力和平整度缺陷通过使用平整度准则推导的临界冠度比来控制；因此，建立了跨各种强度等级和带钢尺寸的连轧工程准则。总的来说，这项工作将平面分析的范式从现象学描述转变为基于力学的分析框架。

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引用次数: 0

High-temperature fatigue curve estimation and random vibration fatigue failure 高温疲劳曲线估计与随机振动疲劳失效

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-01-27 DOI: 10.1016/j.ijmecsci.2026.111318

Zhiyong Qiu , Huan He , Linfeng Qu , Huyin Wang

High-temperature random vibration fatigue is a critical cause of aerospace structural failure, while obtaining high-temperature fatigue curves (S-N curves) remains time-consuming and costly. Thus, a novel and engineering-oriented estimation approach is proposed to predict fatigue strength and high-cycle S-N curves of metallic materials over a wide temperature range. The method requires only room-temperature S-N curve data and limited tensile and yield strengths at multiple temperatures, to establish a direct quantitative relationship between mechanical property degradation and fatigue behavior. The approach was validated through literature data and high-temperature random vibration fatigue tests on TA15 titanium alloy. The results confirm its accuracy and generality, demonstrating that fatigue strength decreases non-linearly with temperature and is strongly correlated with mechanical properties. The predicted high-temperature S-N curves of TA15, applied to fatigue life prediction, showed good agreement with experimental data, confirming the method’s predictive reliability. Further investigations reveal that, under high-temperature random vibration, both stress and velocity response power spectral densities shift toward lower frequencies while maintaining their overall spectral shapes. The combined effects of temperature-dependent stiffness degradation, modal damping, and excitation spectrum distribution lead to a non-monotonic variation in fatigue life with temperature. A moderate temperature rise improves fatigue life owing to higher damping, whereas further heating reduces it as stiffness degradation dominates. This paper presents an efficient, experimentally validated framework for estimating temperature-dependent S-N curves that markedly reduces high-temperature fatigue testing costs. It provides theoretical and engineering guidance for fatigue design and durability assessment of aerospace structures under thermal-vibrational coupling conditions.

高温随机振动疲劳是航空航天结构失效的重要原因，而获取高温疲劳曲线（S-N曲线）耗时且成本高。因此，提出了一种新的工程化估计方法来预测金属材料在宽温度范围内的疲劳强度和高周S-N曲线。该方法只需要室温S-N曲线数据和多个温度下的有限拉伸强度和屈服强度，就可以建立力学性能退化与疲劳行为之间的直接定量关系。通过文献数据和TA15钛合金高温随机振动疲劳试验对该方法进行了验证。结果表明，疲劳强度随温度的变化呈非线性变化，且与力学性能有较强的相关性。将预测的TA15高温S-N曲线应用于疲劳寿命预测，结果与实验数据吻合较好，验证了该方法预测的可靠性。进一步的研究表明，在高温随机振动下，应力和速度响应功率谱密度在保持其整体频谱形状的同时向低频偏移。温度相关的刚度退化、模态阻尼和激励谱分布的综合影响导致疲劳寿命随温度的非单调变化。由于较高的阻尼，适度的温升提高了疲劳寿命，而进一步加热会降低疲劳寿命，因为刚度退化占主导地位。本文提出了一个有效的、经过实验验证的框架，用于估计温度相关的S-N曲线，显著降低了高温疲劳测试成本。为热-振动耦合条件下航空航天结构的疲劳设计和耐久性评估提供理论和工程指导。

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引用次数: 0

New fracture criterion for spot welds of advanced high-strength steels 先进高强钢点焊断裂新准则

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-01-27 DOI: 10.1016/j.ijmecsci.2026.111315

Heng Feng , Christopher DiGiovanni , Cael Johnston , Jidong Kang , Hassan Ghassemi-Armaki , Tingting Zhang , Kaan Inal

Resistance spot welds of advanced high strength steel (AHSSs) are susceptible to various fracture modes associated with distinct fracture paths leading to different loading capacity. To better predict the potential fracture modes and loading capacity of AHSS welds, a new force-based fracture criterion was developed based on the material strength of different regions in the welds together with identification of potential fracture paths. The established fracture criterion is then implemented into finite element (FE) models with the nugget simplification as a beam element in LS-Dyna. To be specific, the dissimilar spot weld stack-ups of Gen3 1180 steel and LCE 1000 steel sheets are investigated. The proposed model is validated by tests of coach peel, tensile shear, and KSII with different loading orientations. The model also predicts the transition of the fracture modes well, particularly when altering the welding procedure to vary the nugget size or microstructure of the heat affected zone (HAZ). Further, it is revealed that using the average material properties across the entire HAZ instead of the distinct HAZ regions, the model still accurately predicts the fracture modes and load capacity of the spot welds.

高级高强度钢电阻点焊具有多种断裂模式，其断裂路径不同，承载能力也不同。为了更好地预测AHSS焊缝的潜在断裂模式和承载能力，基于焊缝不同区域的材料强度，提出了一种新的基于力的断裂准则，并对潜在断裂路径进行了识别。将建立的断裂准则应用到LS-Dyna中以核块简化为梁单元的有限元模型中。具体研究了Gen3 1180钢板与LCE 1000钢板点焊堆焊的差异。通过不同加载方向的车厢剥离、拉伸剪切和KSII试验验证了该模型的有效性。该模型还能很好地预测断裂模式的转变，特别是当改变焊接工艺以改变熔核尺寸或热影响区（HAZ）的显微组织时。此外，该模型使用整个HAZ的平均材料性能，而不是单独的HAZ区域，仍然可以准确地预测点焊的断裂模式和承载能力。

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